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Old 03-07-2008, 16:19   #1 (permalink)
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how do i know if its a 428

Hi.
I have an engine that I was told it is a 429. It was in a 1969 f1502wd with a c6 I think. I am not sure how to check this out. If it it is a 429 or a 390 what are good cores worth?
Any info would be of help.


Thanks Ed
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Old 03-08-2008, 05:45   #2 (permalink)
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Re: how do i know if its a 428

429 or 428? 429 is a 385 series. 428-390 a FE series. FE has 5 valve cover bolts and the heads and intake join together under the valve cover. 66-70 production 428's never came in trucks. So it's a transplant if a 428. 390's yes they came in the F150s. You'll have to do a little detective work. FE's are pretty generic looking on the outside. And most of the casting numbers are too. 428 blocks from 66-70 were marked with a A,C or S sandscratch on the back of the block. Later 428 blocks were service replacements which had no markings or casting number just foundry ID and date code. Best to measure the cyl bore and stroke to be positive of what you have. Especially if you want to sell.

428- 4.13 bore std, 3.98 stroke.
390- 4.05 bore std, 3.78 stroke.

Good 390 cores are $200-400 depending where you are. 428 cores really depend on the timeframe and parts on the engine. CJ, PI or std. Value can range from $800 to a few thousand...maybe more depending.

So tell me what you see on the back of the block if anything. And what number you see on the front left of the block, 352 or a reverse 105. Also the head casting number between the center 2 spark plugs. If you have easy access to the crank get the number off #7 counterweight edge. At worst you have to remove a head to get the true bore if we can't figure it out.
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Old 03-17-2008, 16:25   #3 (permalink)
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Re: how do i know if its a 428

Thank you for the information it has been helpful. I have measured the bore and stroke,4.130x4. It sems to measure up to a 428 fe and I checked the pistons and did not see an oversize stamp. The bore has no ridge on it and looks ok. 5 bolt valve covers, A behind flywheel, 352 on left front of block. On the head c6ae-r dif r. under valve cover 4L26. There is an A on the back of the bock behind the flexplate.

Thanks, Ed
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Old 03-18-2008, 16:34   #4 (permalink)
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Re: how do i know if its a 428

Good deal Ed. Sure sounds like a 428 then!! The C6-R heads are nice heads. Really nice ported with some CJ size valves 2.09/1.65.
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Old 03-19-2008, 16:53   #5 (permalink)
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Re: how do i know if its a 428

Hi,
Thanks for the encouraging words. I am not sure what to do with it, sell or keep and find some wheels for it. Do you know what it might be worth if I want to sell it.

Thanks again Ed
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Old 03-19-2008, 17:49   #6 (permalink)
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Re: how do i know if its a 428

Are you in the US and if so where about...? If your going to sell your block I might be interested.
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